Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac65c0fd34511102…

MALICIOUS

PDF

88.9 KB Created: 2021-07-14 06:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f2cf3c807ff39a5406c28a93719ad7c SHA-1: fb7cd447d3f4abbd3748d3bfcc40f43dc2dd8f1d SHA-256: ac65c0fd34511102fd797d575aa9185410942e2fe6601a154eeaaebf3001dbe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/juos1k3r53qtov70983luufrg6/teloxolitenak.pdf
    • http://amphorabeautyclub.com/campannas/file/rujulud.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/723a18baf785154dae743230c457e7ab/43381584118.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0tcsocob0la5dl9h2rtr5k3phl/vumujofasazora.pdf
    • https://rtvpuls.com/ckfinder/userfiles/files/nipukaxapegakam.pdf
    • http://gramercygrand.ru/files/file/6849473801.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd305bcf34---89995146056.pdf
    • https://holocaustresearch.pl/nowy/photo/file/vusalejew.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/05ecd482f0402bf274d941cf0fcdc12b/wamos.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e4455dae9---55015255735.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160821e3895600---pepudumuvigataja.pdf
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/zifufikaxuben.pdf
    • http://hurtmar.pl/Upload/file/bidapudiwigexu.pdf
    • http://islandpointfl.com/userimages/xebuxarinabewapuvifirelol.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d71acbdb3---79975007796.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202151292527305.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japebugixepagexomirefodil.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b063006bc3---fepitejejozur.pdf
    • https://angelsstaff.com/uploads/file/14347405414.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/935c7e296c86493d98b01fb06abea8c2/tatuwubipukegofavegoxabig.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/95334827251.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e7192b29---95715585910.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6787ce40---ginujuvuxel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=soy+milk+and+kidney+stones
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faa0.bin
18582888d69da2ec586bf5c6127917ca81f653cd40b77527cae5e5afdfe12f5f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 10588 bytes
font_01_sfnt_off000112c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 16792 bytes
font_02_sfnt_off00012ad7.bin
d37801087a8cffe049b64a36e79680818015e0db8f71402b6a2f7ca823042e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD7 16836 bytes